Should I try to read the book or watch the movie? I haven't yet sadly :(

Hitchhikers Guide? It is really quite good. If you like Monty Python figure Hitchhikers Guide as being much like if they had done sci fi. Douglas Adams (the author of the series) was actually a member of Monty Python for a while. The movie certainly was not nearly as good but that is just a normal expectation, it was fairly good in its own right I think.